<form id="form_collage" method="POST" action="#">

    <div class="champ_form_collage">
        <label id="lbl_form_nameCollage" for="form_nom_collage">
            Veuillez nommer votre collage
        </label>
        <hr width ="150px" color="#000000" size="1px">
        <input id="form_nom_collage" type="text" name="form_nom_collage" value="Nom du collage"/>
    </div>
    
    <div id="btn_cancel_collage" class="btn_form_collage">
        <span>Annuler</span>
    </div>
    <span id="separator_btn_form_collage">|</span>
    <div id="btn_validate_collage" class="btn_form_collage" type="submit">
        <span>Valider</span>
    </div>

</form>